THE NEW EXTENDED JPEG CODER WITH VARIABLE QUANTIZER USING BLOCK WAVELET TRANSFORM

This paper describe the new extended JPEG coder with variable quantize r using the block wavelet transform which has more flexibility in repr esenting the image due to a pyramid-like multiresolution decomposition . We replace the discrete cosine transform (DCT) module by block-wise discrete wavelet transform (BDWT) module while keeping all the buildin g blocks of the JPEG extension coder. In addition, we generate the var iable quantization matrix (Q-matrix) based on the HVS and utilize the activity of the each block to control the bit and image quality. The s imulation results show that the proposed scheme has substantially bett er performance than the JPEG extensions.